<template>
  <div class="home-category" @mouseleave="categoryId = null">
    <!-- 左侧分类边侧栏 -->
    <ul class="menu">
      <li
        :class="{ active: categoryId === item.id }"
        v-for="item in menulist"
        :key="item.id"
        @mouseenter="categoryId = item.id"
      >
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink
            v-for="sub in item.children"
            :key="sub.id"
            :to="`/category/sub/${sub.id}`"
            >{{ sub.name }}</RouterLink
          >
        </template>
        <!-- 当数据没有显示时放骨架 -->
        <template v-else>
          +
          <XtxSkeleton
            width="60px"
            height="18px"
            style="margin-right: 5px"
            bg="rgba(255,255,255,0.2)"
          />
          +
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
          +
        </template>
      </li>
    </ul>
    <!-- 弹出层 -->
    <div class="layer">
      <h4 v-if="currentCategory">
        {{ currentCategory.id === "brand" ? "品牌" : "分类" }}推荐
        <small>根据您的购买或浏览记录推荐</small>
      </h4>
      <!-- 分类区 -->
      <ul
        v-if="
          currentCategory &&
          currentCategory.goods &&
          currentCategory.goods.length
        "
      >
        <li v-for="i in currentCategory.goods" :key="i.id">
          <RouterLink to="/">
            <img v-lazy="i.picture" alt="" />
            <div class="info">
              <p class="name ellipsis-2">{{ i.name }}</p>
              <p class="desc ellipsis">{{ i.desc }}</p>
              <p class="price"><i>¥</i>{{ i.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 品牌区 -->
      <ul
        v-if="
          currentCategory &&
          currentCategory.brands &&
          currentCategory.brands.length
        "
      >
        <li class="brand" v-for="i in currentCategory.brands" :key="i.id">
          <RouterLink to="/">
            <img v-lazy="i.picture" alt="" />
            <div class="info">
              <p class="place">
                <i class="iconfont icon-dingwei"></i>{{ i.place }}
              </p>
              <p class="name ellipsis">{{ i.name }}</p>
              <p class="desc ellipsis-2">{{ i.desc }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
import { computed, reactive, ref } from "vue";
import { useStore } from "vuex";
import { findBrand } from "@/api/home.js";
export default {
  name: "HomeCategory",
  setup() {
    const store = useStore();
    // *一级分类只有9个 手动添加第十个品牌分类
    const brand = reactive({
      id: "brand",
      name: "品牌",
      children: [{ id: "brand-children", name: "品牌推荐" }],
      // *品牌列表
      brands: [],
    });
    // *通过计算属性 将手动创建的brand品牌分类添加进所有的一级分类中
    const menulist = computed(() => {
      // *筛选出一级分类中需要用到的数据
      const list = store.state.category.list.map((item) => {
        return {
          id: item.id,
          name: item.name,
          children: item.children && item.children.slice(0, 2),
          goods: item.goods,
        };
      });
      list.push(brand);
      return list;
    });

    // *获得弹出层的当前分类的推荐商品数据
    const categoryId = ref(null);
    const currentCategory = computed(() => {
      return menulist.value.find((item) => item.id === categoryId.value);
    });

    // *获取品牌数据 尽量不要使用async在setup上
    findBrand().then((data) => {
      brand.brands = data.result;
    });

    return { menulist, categoryId, currentCategory };
  },
};
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 9;

  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      z-index: 9;
      &:hover,
      &.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        .hoverShadow();
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
            transition: all 0.4s;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
    li.brand {
      height: 180px;
      a {
        align-items: flex-start;
        img {
          width: 120px;
          height: 160px;
        }
        .info {
          p {
            margin-top: 8px;
          }
          .place {
            color: #999;
          }
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
}
.xtx-skeleton {
  animation: fade 1s linear infinite alternate;
}
@keyframes fade {
  from {
    opacity: 0.2;
  }
  to {
    opacity: 1;
  }
}
</style>